It is 69.
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345
You need at least two numbers to find a GCF. IF that's 3, 4 and 5, the GCF of consecutive nonzero integers is 1.
The greatest common factor (GCF) of 46 and 138 is 46.
The GCF is: 23
GCF(280-4, 1245-3) = GCF(276, 1242) = 138